Burglar-alarm



" A. A. TERSTYANSKY.

Patented June 1, 1920.

U N l TED S T T ALBERT A. TERSTYANSKY, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR T0 WINCHESTER REPEATING ARMS (30., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

BURGLAR-ALARM,

Specification of Letters Patent.

Patented. June 1, 1920.

Application filed October 7, 1919. Serial No. 329,048.

To all whom it may concern: I

Be it known that I, ALBERT A. TERsTYAN- SKY, formerly a subject of the former Emperor of Hungary, residing at Budgepprt, in the county of Fairfield and State of (Jonnecticut, have invented a new and useful Improvement in Burglar-Alarms; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear,' and exact description of the same, and which sa d drawings constitute part of this application, and represent, in-- Figure 1, a perspective view of a doorholding burglar alarm, constructed in accordance with the present invention Fig. 2, a top plan view thereof, its cover being in open position to show the interlor construction.

Fig. 3, a section taken on llne 3-8 of Fig. 2.

Fig. 41, a front elevation of the alarm.

The present inventlon relates to burglar alarms, and more particularly to detonatlng alarms.

One of the objects of the invention is to provide a simple and eflicient construction which may be so located, wlth reference to a door, that the opening of the door, will interpose a stop, to prevent the openlng movement, and at the same time set off an alarm.

Another object of the invention 1s to devise an apparatus of this type which is efiicient in operation and capable of manufacture on a commercial scale, or in other words one which is not so ditlicult to produce as to be beyond the reasonable cost of such an article.

iVith these and other objects in view,

I which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and proportion of the several parts and details of construction within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

The alarm comprises a casmg 10, includ ing a bottom 11, sides 12 of triangular'configuration, an end 13 and a cover 14, that is hinged at 15 to the said bottom. Each side 12 has the shape of a right-angled triangle, whose base rests upon the bottom 11 of the casing, while its vertical side is farthest from the hinge 15, whereby a wedge-shaped casing is obtained. Upon the bottom of this casin are formed downwardl ro-' 19. Each of these hammers is made in the form of a bar, projecting through a slot 20 outside of the casing. The spring 18 is'held on the projection 17 in any-suitable manner, for instance, by lugs 21, which are made, in the case illustrated in the drawings, integral with the saidprojection. The casing is made of sheet metal, the lugs being stamped out of the body of the projection 17 and bent over the spring, so as to hold the same securely in position. Each detonating hammer carries a cylindrical stud 22 on that side thereof which faces the respective casing side 12. Over each stud is adapted to be drawn a percussion cap 23.

The slot 20 extends horizontally substantially throughout the width of the casing end 13 and merges into a notch 24 above the slot. The length of this notch is smaller than that of the slot, and is of a height that is somewhat greater than the thickness of a hammer 19, presenting vertical shoulders 25, against which the hammers are adapted r to abut, as will hereinafter appear.

The edge of the cover 14, opposite the hinge 15, is provided with a downwardly extending flange 26, that is adapted to rest on the detonating hammers, when the latter are disposed within the notch 24, as clearly appears from Fig. 4 of the drawings.

The operation of the device is as follows :The alarm is placed upon the floor in such a manner that the point of its wedge is located close to the door sill, the door being shown at 27 in the drawings. In the operative position, the detonating hammers are set so as to project through the notch 24 in the casing end 18, whereby the spring is held under tension. The cover 14 is set to closed position. If it is attempted to open the door, the latter forces the cover 14: around its hinge downward, whereby the hammers 19 are disengaged from the shoulders 25, that is to say they are depressed. The spring 18 is thus free to act, throwing the hammers forcibly toward the casing 12, the caps being exploded as they are struck against the said sides, giving thus notice of the unauthorized opening of the door.

It is to be observed that the pressure caused by the door upon the wedge-shaped casing forces the prongs 16 effectively into the floor, so that the alarm cannot be moved from its place by the movement of the door. In fact, the Wedge-shaped casing prevents the opening of the door beyond a certain point, and thus the person from entering the apartment. The device acts thus, besides being aburglar alarm, as a safety device for the door.

I claim 1. A burglar alarm comprising a wedgeshaped casing including a cover hinged thereto adjacent the point of its wedge and provided at its opposite free end with a flange adapted to extend into said casing, the end of said casing adjacent said flange being provided with a horizontal slot extending substantially throughout the width of said end and merging into a notch that is disposed above said slot and of a length less thanAthat of said slot, spring-pressed detonating hammers within said casing adapted to project through said notch, and cap-carrying means on said hammers adapted to contact with the sides of said casing, said flange resting normally on said hammers when the latter are disposed within said notch, whereby, upon depressing said cover, said hammers are forced into said slot, thereby rendering the spring operative.

2. A burglar alarm comprising a wedgeshaped casing including .a cover hinged thereto adjacent the point of its wedge and provided at its opposite free end with a flange adapted to extend into said casing, spring-pressed detonating hammers within said casing, cap-carrying means on said hammers adapted to contact with the sides of said casing, shoulders on said casing for keeping said hammers adjacent the casing center against the action of the spring, said flange resting normally on said hammers when the latter are in engagement with said shoulders, whereby, upon depressing said cover, said hammers are disengaged from said shoulders and the spring rendered operative.

3. A burglar alarm comprising a wedgeshaped casing, a hinged cover therefor, and a pair of spring-actuated detonating-hammers located within the casing for lateral movement therein in the plane thereof when released by the cover, the said arms projecting through the casing for manual operation in being cooked and co-acting with the sides of the casing for the detonation of the caps.

4. A burglar alarm having a wedgeshaped casing provided at its broad end with a lateral cocking-opening, a yielding cover for the said casing, and a spring-actuated detonating-hammer located within the casing for lateral movement therein in the plane thereof, projecting through the said opening for manual operation in being cooked, and released by the cover for the detonation of a cap when the cover is pressed downward.

5. A burglar alarm comprising a wedgeshaped casing provided at its broad end with a lateral cocking-opening, a yielding cover provided at its'free end with a downwardly turned flange, and a spring-actuated detonating-hammer located within the casing for lateral movement therein in the plane thereof, projecting through the said cocking-opening for manual operation in be-- ing cocked, and engaged by the said flange when the cover is pressed downward for being released for the detonation of a cap.

6. A burglar alarm comprising a wedgeshaped casing the broad end of which is formed with a transverse cocking-opening, a yielding cover provided at its free end with a downwardly turned flange, and a pair of spring-actuated detonating-hammers located within the casing for lateral movement therein in opposite directions in the plane thereof, projecting through the said transverse opening for manual operation in being cocked, and engaged by the said flange of the cover when the same is pressed downward for being released for the detonation of the caps.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. 1

ALBERT A. TERSTYANSIQY.

Witnesses THOMAS C. JOHNSON, ERIK S. PALMER. 

